Same issue here.
Easily reproducible by running an iPad App on Mac (Designed for iPad) and resizing the window while any popover view is displayed.
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Looks like XCode fails to edit the info.plist by itself.
You can add the UILaunchStoryboardName manually to get past this issue.
There are detailed steps here:
https://stackoverflow.com/a/79164493/5561658
If anyone from Apple reads this: This is a bug and should be fixed.
Sorry for the slow response. I didn’t find the situation I was looking for. Talked to Apple support about it and they encouraged me to use the storyboards method instead.